package org.cloudbus.cloudsim.examples;

import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.LinkedList;
import java.util.List;

import org.cloudbus.cloudsim.Cloudlet;
import org.cloudbus.cloudsim.CloudletSchedulerTimeShared;
import org.cloudbus.cloudsim.Datacenter;
import org.cloudbus.cloudsim.DatacenterBroker;
import org.cloudbus.cloudsim.DatacenterCharacteristics;
import org.cloudbus.cloudsim.Host;
import org.cloudbus.cloudsim.Log;
import org.cloudbus.cloudsim.Pe;
import org.cloudbus.cloudsim.Storage;
import org.cloudbus.cloudsim.UtilizationModel;
import org.cloudbus.cloudsim.UtilizationModelFull;
import org.cloudbus.cloudsim.Vm;
import org.cloudbus.cloudsim.VmAllocationPolicySimple;
import org.cloudbus.cloudsim.VmSchedulerTimeShared;
import org.cloudbus.cloudsim.core.CloudSim;
import org.cloudbus.cloudsim.provisioners.BwProvisionerSimple;
import org.cloudbus.cloudsim.provisioners.PeProvisionerSimple;
import org.cloudbus.cloudsim.provisioners.RamProvisionerSimple;

/**
 * A simple example showing how to create a datacenter with one host and run one
 * cloudlet on it.
 */
public class Exampl1 {

        /** The cloudlet list. */
        private static List<Cloudlet> cloudletList;

        /** The vmlist. */
        private static List<Vm> vmlist;

        /**
         * Creates main() to run this example.
         *
         * @param args the args
         */
        public static void main(String[] args) {

                Log.printLine("Starting CloudSimExample1...");

                try {
                        // First step: Initialize the CloudSim package. It should be called
                        // before creating any entities.
                        int num_user = 1; // number of cloud users
                        Calendar calendar = Calendar.getInstance();
                        boolean trace_flag = false; // mean trace events

                        // Initialize the CloudSim library
                        CloudSim.init(num_user, calendar, trace_flag);

                        // Second step: Create Datacenters
                        // Datacenters are the resource providers in CloudSim. We need at
                        // list one of them to run a CloudSim simulation
                        Datacenter datacenter0 = createDatacenter("Datacenter_0");

                        // Third step: Create Broker
                        DatacenterBroker broker = createBroker();
                        int brokerId = broker.getId();

                        // Fourth step: Create one virtual machine
                        vmlist = new ArrayList<Vm>();

                        // VM description
                        int vmid = 0;
                        int mips = 1000;
                        long size = 10000; // image size (MB)
                        int ram = 512; // vm memory (MB)
                        long bw = 1000;
                        int pesNumber = 1; // number of cpus
                        String vmm = "Xen"; // VMM name

                        // create VM
                        Vm vm = new Vm(vmid, brokerId, mips, pesNumber, ram, bw, size, vmm, new CloudletSchedulerTimeShared());

                        // add the VM to the vmList
                        vmlist.add(vm);

                        // submit vm list to the broker
                        broker.submitVmList(vmlist);

                        // Fifth step: Create one Cloudlet
                        cloudletList = new ArrayList<Cloudlet>();

                        // Cloudlet properties
                        int id = 0;
                        long length = 400000;
                        long fileSize = 300;
                        long outputSize = 300;
                        UtilizationModel utilizationModel = new UtilizationModelFull();

                        Cloudlet cloudlet = new Cloudlet(id, length, pesNumber, fileSize, outputSize, utilizationModel, utilizationModel, utilizationModel);
                        cloudlet.setUserId(brokerId);
                        cloudlet.setVmId(vmid);

                        // add the cloudlet to the list
                        cloudletList.add(cloudlet);

                        // submit cloudlet list to the broker
                        broker.submitCloudletList(cloudletList);

                        // Sixth step: Starts the simulation
                        CloudSim.startSimulation();

                        CloudSim.stopSimulation();

                        //Final step: Print results when simulation is over
                        List<Cloudlet> newList = broker.getCloudletReceivedList();
                        printCloudletList(newList);

                        // Print the debt of each user to each datacenter
                        datacenter0.printDebts();

                        Log.printLine("CloudSimExample1 finished!");
                } catch (Exception e) {
                        e.printStackTrace();
                        Log.printLine("Unwanted errors happen");
                }
        }

        /**
         * Creates the datacenter.
         *
         * @param name the name
         *
         * @return the datacenter
         */
        private static Datacenter createDatacenter(String name) {

                // Here are the steps needed to create a PowerDatacenter:
                // 1. We need to create a list to store
                // our machine
                List<Host> hostList = new ArrayList<Host>();

                // 2. A Machine contains one or more PEs or CPUs/Cores.
                // In this example, it will have only one core.
                List<Pe> peList = new ArrayList<Pe>();

                int mips = 1000;

                // 3. Create PEs and add these into a list.
                peList.add(new Pe(0, new PeProvisionerSimple(mips))); // need to store Pe id and MIPS Rating

                // 4. Create Host with its id and list of PEs and add them to the list
                // of machines
                int hostId = 0;
                int ram = 2048; // host memory (MB)
                long storage = 1000000; // host storage
                int bw = 10000;

                hostList.add(
                        new Host(
                                hostId,
                                new RamProvisionerSimple(ram),
                                new BwProvisionerSimple(bw),
                                storage,
                                peList,
                                new VmSchedulerTimeShared(peList)
                        )
                ); // This is our machine

                // 5. Create a DatacenterCharacteristics object that stores the
                // properties of a data center: architecture, OS, list of
                // Machines, allocation policy: time- or space-shared, time zone
                // and its price (G$/Pe time unit).
                String arch = "x86"; // system architecture
                String os = "Linux"; // operating system
                String vmm = "Xen";
                double time_zone = 10.0; // time zone this resource located
                double cost = 3.0; // the cost of using processing in this resource
                double costPerMem = 0.05; // the cost of using memory in this resource
                double costPerStorage = 0.001; // the cost of using storage in this
                                                                                // resource
                double costPerBw = 0.0; // the cost of using bw in this resource
                LinkedList<Storage> storageList = new LinkedList<Storage>(); // we are not adding SAN
                                                                                                        // devices by now

                DatacenterCharacteristics characteristics = new DatacenterCharacteristics(
                                arch, os, vmm, hostList, time_zone, cost, costPerMem,
                                costPerStorage, costPerBw);

                // 6. Finally, we need to create a PowerDatacenter object.
                Datacenter datacenter = null;
                try {
                        datacenter = new Datacenter(name, characteristics, new VmAllocationPolicySimple(hostList), storageList, 0);
                } catch (Exception e) {
                        e.printStackTrace();
                }

                return datacenter;
        }

        // We strongly encourage users to develop their own broker policies, to
        // submit vms and cloudlets according
        // to the specific rules of the simulated scenario
        /**
         * Creates the broker.
         *
         * @return the datacenter broker
         */
        private static DatacenterBroker createBroker() {
                DatacenterBroker broker = null;
                try {
                        broker = new DatacenterBroker("Broker");
                } catch (Exception e) {
                        e.printStackTrace();
                        return null;
                }
                return broker;
        }

        /**
         * Prints the Cloudlet objects.
         *
         * @param list list of Cloudlets
         */
        private static void printCloudletList(List<Cloudlet> list) {
                int size = list.size();
                Cloudlet cloudlet;

                String indent = "    ";
                Log.printLine();
                Log.printLine("========== OUTPUT ==========");
                Log.printLine("Cloudlet ID" + indent + "STATUS" + indent
                                + "Data center ID" + indent + "VM ID" + indent + "Time" + indent
                                + "Start Time" + indent + "Finish Time");

                DecimalFormat dft = new DecimalFormat("###.##");
                for (int i = 0; i < size; i++) {
                        cloudlet = list.get(i);
                        Log.print(indent + cloudlet.getCloudletId() + indent + indent);

                        if (cloudlet.getCloudletStatus() == Cloudlet.SUCCESS) {
                                Log.print("SUCCESS");

                                Log.printLine(indent + indent + cloudlet.getResourceId()
                                                + indent + indent + indent + cloudlet.getVmId()
                                                + indent + indent
                                                + dft.format(cloudlet.getActualCPUTime()) + indent
                                                + indent + dft.format(cloudlet.getExecStartTime())
                                                + indent + indent
                                                + dft.format(cloudlet.getFinishTime()));
                        }
                }
        }

}
